yamlExpansionDepth: with deeply nested structures, YAML expansion can produce a lot of whitespace indentation. To keep lines from going off the screen horizontally, you can set the maximum depth of the structure to expand before switching to a more compact inline format. The default value is 6.
yamlIndentationSpaces: introduced with version 0.0.9, this is the number of spaces to use when indenting YAML. The default value is 4, but when upgrading, this setting will initialize to the previous value, which was the workspace editor tabSize setting.